1. Ubuntu Security Notices
  2. USN-8920-1

USN-8920-1: Linux kernel vulnerabilities

Publication date

13 October 2026

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:

  • Ethernet bonding driver;
  • Network drivers;
  • F2FS file system;
  • Network file system (NFS) server daemon;
  • Tracing infrastructure;
  • io_uring subsystem;
  • Networking core;
  • IPv6 networking;
  • IUCV driver;
  • Netfilter;
  • RxRPC session sockets

Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:

  • Ethernet bonding driver;
  • Network drivers;
  • F2FS file system;
  • Network file system (NFS) server daemon;
  • Tracing infrastructure;
  • io_uring subsystem;
  • Networking core;
  • IPv6 networking;
  • IUCV driver;
  • Netfilter;
  • RxRPC session sockets

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
20.04 LTS focal linux-image-5.4.0-1111-ibm –  5.4.0-1111.116  
linux-image-5.4.0-1165-aws-fips –  5.4.0-1165.176+fips1  
linux-image-5.4.0-1170-azure-fips –  5.4.0-1170.176+fips1  
linux-image-aws-fips –  5.4.0.1165.112  
linux-image-aws-fips-5.4 –  5.4.0.1165.112  
linux-image-azure-fips –  5.4.0.1170.106  
linux-image-azure-fips-5.4 –  5.4.0.1170.106  
linux-image-ibm-5.4 –  5.4.0.1111.140  
linux-image-ibm-lts-20.04 –  5.4.0.1111.140  
18.04 LTS bionic linux-image-5.4.0-1111-ibm –  5.4.0-1111.116~18.04.1  
linux-image-5.4.0-1165-aws –  5.4.0-1165.176~18.04.1  
linux-image-aws –  5.4.0.1165.176~18.04.1  
linux-image-aws-5.4 –  5.4.0.1165.176~18.04.1  
linux-image-ibm –  5.4.0.1111.116~18.04.1  
linux-image-ibm-5.4 –  5.4.0.1111.116~18.04.1  

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References

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